Datasheet

CC3100
www.ti.com SWAS031D –JUNE 2013–REVISED FEBRUARY 2015
4.11.3.5 Input Clocks/Oscillators
Table 4-6 lists the RTC crystal requirements.
Table 4-6. RTC Crystal Requirements
CHARACTERISTICS CONDITION SYM MIN TYP MAX UNIT
Frequency 32.768 kHz
Frequency accuracy Initial + temp + aging ±150 ppm
Crystal ESR 32.768 kHz, C1 = C2 = 10 pF 70 kΩ
Table 4-7 lists the external RTC digital clock requirements.
Table 4-7. External RTC Digital Clock Requirements
CHARACTERISTICS CONDITION SYM MIN TYP MAX UNIT
Frequency 32768 Hz
Frequency accuracy ±150 ppm
(Initial + temp + aging)
Input transition time t
r
/t
f
(10% to 90%) t
r
/t
f
100 ns
Frequency input duty cycle 20 50 80 %
Slow clock input voltage limits Square wave, DC coupled V
ih
0.65 × V
IO
V
IO
V
V
il
0 0.35 × V
IO
V peak
Input impedance 1 MΩ
5 pF
Table 4-8 lists the WLAN fast-clock crystal requirements.
Table 4-8. WLAN Fast-Clock Crystal Requirements
CHARACTERISTICS CONDITION SYM MIN TYP MAX UNIT
Frequency 40 MHz
Frequency accuracy Initial + temp + aging ±25 ppm
Crystal ESR 40 MHz, C1 = C2 = 6.2 pF 40 50 60 Ohm
4.11.3.6 WLAN Filter Requirements
The device requires an external bandpass filter to meet the various emission standards, including FCC. Table 4-
9 presents the attenuation requirements for the bandpass filter. TI recommends using the same filter used in the
reference design to ease the process of certification.
Table 4-9. WLAN Filter Requirements
Requirements
Parameter Frequency (MHz)
Min Typ Max Units
Return loss 2412 to 2484 10 dB
Insertion loss
(1)
2412 to 2484 1 1.5 dB
(1) Insertion loss directly impacts output power and sensitivity. At customer discretion, insertion loss can be relaxed to meet attenuation
requirements.
Copyright © 2013–2015, Texas Instruments Incorporated Specifications 19
Submit Documentation Feedback
Product Folder Links: CC3100